Skip to main content
Select Source:

telome theory

telome theory The theory that the leaves (megaphylls) of ferns and seed plants evolved by the modification of terminal branches (telomes) of stems. It envisages that firstly, instead of the primitive equal (dichotomous) branching of the stem, there developed a main axis with lateral side branches. Next, each lateral branch system was restricted to one plane, instead of forming a three-dimensional pattern. Lastly, the spaces between the telomes in each lateral branch system were gradually filled in by webbing consisting of thin sheets of photosynthetic parenchymatous tissue. There is fossil evidence for this sequence of events occurring in certain trimerophytes and progymnosperms, notably in trees of the genus Archaeopteris, of the late Devonian period.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"telome theory." A Dictionary of Biology. . Encyclopedia.com. 25 Sep. 2017 <http://www.encyclopedia.com>.

"telome theory." A Dictionary of Biology. . Encyclopedia.com. (September 25, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/telome-theory-0

"telome theory." A Dictionary of Biology. . Retrieved September 25, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/telome-theory-0

telome theory

telome theory A hypothesis suggesting that the fern leaf arose from various rearrangements of branching stem systems.

Cite this article
Pick a style below, and copy the text for your bibliography.

  • MLA
  • Chicago
  • APA

"telome theory." A Dictionary of Earth Sciences. . Encyclopedia.com. 25 Sep. 2017 <http://www.encyclopedia.com>.

"telome theory." A Dictionary of Earth Sciences. . Encyclopedia.com. (September 25, 2017). http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/telome-theory

"telome theory." A Dictionary of Earth Sciences. . Retrieved September 25, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/telome-theory